U-boats of WWI

Most Successful U-boats

Below are the 30 most successful U-boats of World War One.

Boat	Ships sunk	Tons sunk	Ships hit during
U 35	226 ships	538,497 tons	1915 - 1918
U 39	154 ships	406,320 tons	1915 - 1918
U 38	139 ships	293,104 tons	1915 - 1918
U 34	119 ships	257,652 tons	1915 - 1918
U 53	88 ships	224,528 tons	1916 - 1918
U 63	73 ships	203,537 tons	1916 - 1918
U 33	83 ships	193,689 tons	1915 - 1918
U 64	46 ships	147,869 tons	1916 - 1918
UC 17	98 ships	147,154 tons	1916 - 1918
U 20	37 ships	145,829 tons	1915 - 1916
U 46	52 ships	140,314 tons	1916 - 1918
U 70	54 ships	139,064 tons	1916 - 1918
UC 21	98 ships	134,139 tons	1916 - 1917
U 55	64 ships	133,742 tons	1916 - 1918
U 62	48 ships	132,811 tons	1917 - 1918
UB 40	99 ships	132,044 tons	1916 - 1918
UB 18	128 ships	131,803 tons	1916 - 1917
UB 57	47 ships	129,173 tons	1917 - 1918
UC 65	106 ships	127,218 tons	1917 - 1917
U 24	35 ships	121,103 tons	1915 - 1917
U 155	43 ships	120,441 tons	1917 - 1918
U 32	38 ships	120,034 tons	1915 - 1918
U 86	33 ships	119,575 tons	1917 - 1918
U 73	21 ships	116,199 tons	1916 - 1918
U 43	45 ships	114,323 tons	1916 - 1918
UB 50	39 ships	113,634 tons	1917 - 1918
U 21	40 ships	113,580 tons	1914 - 1917
UC 71	61 ships	110,688 tons	1917 - 1918
U 82	36 ships	110,160 tons	1916 - 1918
UB 48	35 ships	107,756 tons	1917 - 1918
	2,185 ships	5,025,980 tons

Most of these boats were of course commanded by the most successful U-boat commanders of WWI.

WWI U-boat commanders section